Pivot-lathe.



A. SIRAND' PIVOT LATHE. APPLICATION FILED JUNE 8. I914. RENEWED DEC- 19.191?- Patented Apr. 2, 1918.

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iwvewtow Auguste Sirand.

1 0 m o W a A. SIRAND.

PIVOT LATHE.

APPLICATION FILED JUNE 8, I914. RENEWED DEC. 19| 19 17- 1,261,062.

Patented Apr. 2, 1918.

2 SHEETS-SHEET 2- 51mm Auguste Sirand.

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auensrn SIBANID, or GONSTANTINE, Anennia.

PIVOT-LATHE.

Application filed June s, 1914, Serial no. 843,851.

To all whom it may concern:

Be it known that I, AUcUs'rn SIRAND, a citizen of the Republic of France. residing at Constantine, Algeria, 2 Rue Nationale, clock-maker, have invented a certain new and useful Pivot-Lathe, of which thefollowing is a specification.

This invention relates to pivot lathes for forming on rotary pieces, reduced cylindrical parts designed toserve as pivots.

The object of the invention is to provide a lathe so constructed that the approach of the milling wheel toward the pin support is limited, the piece to be provided with a pivot. also having an abutment against which the milling wheel bears when the pivot is made, said abutment being supported by a regulatingand wear-taking device. By so constructing this lathe. the wear of the pin support by the milling wheel is avoided and a rigorous precision in the size of the pivots may be retained indefinitely.

The embodimentof this invention is illustrated by way of example in the accompanying drawings in which:

Fi ure 1 re resents a front elevationof a pivot lathe constructed in accordance with this inventlon;

Fig. 2 isa transverse vertical section taken on the line AA of Fig. 1;

Fig. 3 is a top plan view, a portion of the lathe being lowered horizontally back;

Fig. 1 is a plan view of a set clip;

Figs. 5 and 6represent respectively an elevation and a plan of the regulating P c U 1 Figs. 7 and 8 represent respectively front and side elevations of the abutment;

Fig. 9 is a detail on a larger scale of the milling wheel and the pin support;

Figs. 1O, 11 and 12 represent on a larger scale, the cooperating members of the milling Wheel, the pin support, and the abutment; and

Fig. 13 represents a perspective view of the pin support.

The machine as illustrated comprises a mainframe 1 and a movable yoke 2, the latter being jointed on a spindle 3 which is mounted in lugs 4 secured to the rear of the main frame 1.

A pin support 5 is supported at the left of the main frame 1, and has a head 6 which is provided in a well known mannerwith aseries of slots or notches 7, (see Figs. 9 and 13), and which can be turned and se Specification of Letters Patent.

Fatented Apr. 2, 1918.

Renewed December 19, 1917. Serial No. 207,990.

The notches 5" of this wheel are designed to cooperate with a stop rod 5 fixed to the frame 1 in a plane below the wheel 5 to iusure the exact position of the notches 7 of the head 6, as. is shown clearly in Fig. 1. After the position of the spindle has been. regulated, it is made immovable by a clamp screw.

A shaft 8 is supported at the right of the main frame 1 and has its ends pointed. The axis of this shaft is located in front of the slot at the top of the pin support A. pinion 9 is mounted on this shaft 8 and is provided with a circular groove in the hub thereof with which is engaged a disk 10 associated with a threaded rod 11 carried by the main frame 1 so that when said rod is turned, the shaft 8 will be reciprocated longitudinally. A clip 12 having a screw 12, serves to retain the rod 11 in adjusted position by tightening the screw and clamping the clip to the rod, said clip being carried by the main frame 1.

The base of the main frame has a threaded socket 13 screwed thereinto and which is provided with an. arm in the shape of a sec tor 1 1 designed for turning said socket and having a graduated scale thereon which is movable beneath a fixed index 15, carried by said base, (see Fig. 1.) A rod 16 passes freely through the socket 13 and is provided with a button 17 at its lower end and at its upper end is provided with a flat head 18 constructed of hard steel having an opening 19 therein for the passage of the head 6 of the pin 5,and which serves as an abutment to preventthe descent of the milling wheel 28. A clip 20 is mounted on the rod 16 and comprises a split collar adjustably mounted and designed to be retained in adjusted position by means of a set screw 20. This clip rests on the top of the socket 13 and is held in engagementtherewith by the pressure of a spring 21. This device pro vides for the regulation with precision, of the head of the abutment 18 and for correcting the wear as it is produced as will be hereinafter more fully described. The movable yoke 2 supports a crank shaft 22 on which are fixed two gear wheels 23 and 24, the wheel 23 meshing with the pinion 9 carried by the shaft 8 when the yoke 2 is raised vertically as shown in Figs. 1 and 2 and is held in this position by means of a catch 25. An arm 26 is jointed on the shaft 22 and 5 carries a shaft 27 on which the milling wheel 28 is mounted. This shaft 27 is constructed of hardened steel. or other very hard material. A. pinion 29 is also mounted on the shaft 27 and meshes with the gear wheel 24 so that the rotation of the crank shaft will be transmitted to the milling wheel in all positions of the arm 26. When this arm 26 is lowered rearwardly as shown in Fig. 8 it comes in contact with a stop 30 secured to the yoke 2. Whenthe arm is lowered toward the front, the milling wheel assumes a position above the abutment 18 and the head 6 of the pin support 5 as shown in Fig. 1. The position of the arm 20 26 is then fixed by means of a point or stud 31 which engages an aperture in the main frame 1.

Before work is begun on the pivot, the position. of the abutment 18 is regulated in order to take up the wear when required, and for such position, the screw 20 of the clip 20 is loosened and the set screw 14 of the sector 14- is also loosened.

The sector 1 1 is then turned as far as possible to the point marked zero, whereby the socket 13 is lowered. The yoke 2 is then raised vertically and fixed in place by the catch 25, and the arm 26 carrying the milling wheel 28 is lowered toward the front and its point or stud 31 engaged with the aperture 32 in the main frame and said arm is held in lowered position by the fore finger of the left hand of the operator to cause the milllng wheel 28 to bear on the top of the head 6 of the pin support. Simultaneously the thumb of the left hand of the operator is brought to bear on the button '17 to lift the abutment through the rod 16 until it comes in contact with the milling wheel 28 as is shown in Fig. 10. The top of theabutment 18 is then placed exactly n a level with the pin 5. The operator then, with" his right hand, turns the screw 20 of the clip 20 to tighten it and the sector 14 is moved toward the operator to the desired point on the scale on said sector which lifts both the socket 13 and the abutment 18, carrying with it the milling wheel 28. By moving these parts, a determined space. for 5 instance about two hundredths of a millimeter, is thus provided between the milling wheel 28 and head 6 of the pin support 5, (see Fig. 11).

After having raised the arm carrying the milling wheel 28, the spindle to be formed into a pivot is placed on one side on the point of the shaft 8 and at the other side in the top notch 7 of the pin support 5,

. (see Fig. 12.) Then the arm 26 is again lowered to cause the milling wheel 28 to bear"on"said spindle and the lathe set in motion to revolve both the spindle and the milling wheel. When the milling wheel 28 frictionally engages the abutment 18 to such an extent that the sound thereof may be heard, the operation is discontinued. The diameter .of the pivot being formed will thus be determined by the depth of the notch 7 of the pin support, plus two hundredths of a millimeter. The pin support will never be attacked and the calibering of its notches will remain invariable.

From the above description, it will be obvious that the lathe thus fitted, may be operated by an unskilled workman, where by pivots may be quickly constructed in a most perfect manner without any risk of either breakage or default of adjustment.

The use of the abutment 18 carried by the rod 16 and of its adjustingdevice, prevents the milling wheel from bearing on the pin support and wearing the same after the pivot has been finished and its position may always be regulated with great precision, whatever the wear of the abutment may The top of the abutment 18 which is beveled, supports the milling wheel at its center so that neither the portion of the milling wheel which performs the work nor the head of the pin support is ever damaged. 9

I claim as my invention: 7

1. A pivot lathe comprising a main frame,

a pin support for the pivot to be formed carried by said main frame,"a milling wheel positioned above said support, a movable 10 support for said milling wheel for permitting it to be raised and lowered,- an abutment sliding against the pin support in a vertical direction, a socket in which said abutment is slidably mounted, means for setting the abutment in the socket at any desired height, and means for raising and lowering the socket in relation to the main frame, said abutment being'so constructed that the periphery of the milling wheelwill 1 abut thereagainst. V

2. A pivot lathe comprising a main frame,

a pin support mounted onsaid frame and adapted to support the pivot to be formed,

a yoke jointed on said main frame, a shaft 11 mounted in said yoke, a crank on-said shaft,

an arm loosely mounted on said shaft, a milling Wheel mounted on said arm above said pin support, means connected to revolve said milling wheel from said shaft, an abut- 1 ment sliding against said pin support in a vertical direction, and'means for holding said abutment at any desired height, said abutment being so arranged that the periphery of the milling wheel will abut thereagainst.

3. A pivot lathe comprising a main frame, a pin support mountedon the main frame and adapted to support one end of the pivot to be made, a shaft mounted on the main frame and adapted to support the other end of said pivot, a pinion on said shaft, a yoke jointed to the main frame, a shaft mounted in said yoke, a crank and a gear wheel fixed on said shaft, said gear wheel meshing with the pinion on the first mentioned shaft, an arm loosely mounted on the second mentioned shaft, a milling wheel mounted on.

said arm, and means for revolving the milling wheel from the second mentioned shaft.

4. In a pivot lathe the combination of a main frame, a vertically movable milling wheel carried thereby, a socket in said main frame, a rod slidable in said socket, a split collar sliding on said rod and resting on said socket, means for tightening said collar, and a spring bearing on the collar and forc ing it into engagement with said socket, said socket having a head against which the milling wheel abuts.

5. In a pivot lathe the combination of a main frame, a milling wheel mounted thereon to be raised and lowered, a socket screwed in said frame, a graduated sector fixed to said socket, a fixed index cooperating with said sector, a rod sliding in said socket, a clip on said rod adapted to rest on said socket, a spring engaging said clip and forcing it into contact with said socket, said rod having a head against which the milling wheel is adapted to abut.

6. In a pivot lathe the combination of a pin support adapted to support the spindle to be formed into a pivot, a milling wheel positioned above said pin support and adapted to be raised and lowered, an abutment engaging the pin support and adapted to be raised and lowered, the top of said abutment being so positioned that the milling wheel may abut thereagainst, and means for regulating the height of said abutment.

7. In a pivot lathe the combination of a pin support having a head adapted to sup port a spindle to be made into a pivot, an abutment comprising a rod and a flat head provided with an opening through which the head of the pin support passes, and means for regulating the height of said abutment in relation to said pin support.

In testimony, that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

AUGUSTE SIRAND. lVitnesses:

CHAS. P. PREssLY, MAURICE Roux.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

